Cisco SX350 Series Administration Manual page 689

Smart Network Application (SNA)
Overlays
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
Only one overlay can be active at a time, therefore selecting an overlay deactivates any other
active overlay.
The following overlays are supported:
• Link Utilization
• PoE Information
• VLAN Membership
• STP Information
Link Utilization
This overlay adds information to the topology map and explorer screens regarding the current
utilization level (for the last 15 seconds) of the connections in the network.
The connections and links are color-coded, according to the volume of traffic that flows in
them in both directions.
By default, the following are the thresholds and their colors:
•
0%-69% - Normal
•
70%-89% - Yellow
•
90%-100% - Red
Connections between devices in the topology view are colored according to the most heavily
utilized individual link in the connection. When viewing the connection explorer, each link
shows its own utilization in both directions.
The utilization for each direction of a link is calculated by checking the information from both
sides, if the link is between SNA-capable devices and using the higher value as the utilization
value.
For example, if a link is between port 1 of device A and port 2 of device B, the calculation of
one direction is a comparison between the Tx value of port 1 and the Rx value of port B. The
higher value determines the utilization of the link.
If only one side of the link is an SNA-capable device, the utilization of the link is determined
by the information from the SNA-capable device only.
When determining the most heavily-utilized link for the aggregated display on the topology
map, each direction of a link is considered a separate link. For example: if one direction of a
link has a utilization of 5% and the other direction has a utilization of 92%, the aggregated
connection in the topology map is red, as the highest utilization in the connection is 92%.
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